What are Nanomaterials?

Nanomaterials are materials having one or more external dimensions, or an internal structure of 100 nm or less, which could exhibit novel characteristics compared to the same material without nanoscale features.*

Are there special risks associated with nanomaterials?

Unusual physical, chemical, and biological properties are associated with materials at the nanoscale. Many of these properties are useful, but they can also change toxicity and increase the potential for negative health effects in the body.